title: Study of aggregation induced emission of cyano-substituted oligo (p-phenylenevinylene) by femtosecond time resolved fluorescence.
abstract: The aggregation induced emission (AIE) mechanism of the cyano-substituted oligo (p-phenylenevinylene)1,4-bis [1-cyano-2-(4-(diphenylamino) phenyl) vinyl] benzene (TPCNDSB) is investigated by time resolved fluorescence technique. By reconstructing the time resolved emission spectra (TRES), it is found that in solvent of low polarity, the emission is mainly from the local emission (LE) state with high quantum yield, but in high polarity solvent, the emission is mainly from the intramolecular charge transfer (ICT) state, which is a relatively dark state, with low quantum yield. In crystal form, the restriction of transfer from LE state to ICT state results in efficient AIE.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China.
authors.forename: Zi-Qi
authors.initials: ZQ
authors.lastname: Yan
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Yang
authors.forename: Hai
authors.initials: H
authors.lastname: Wang
authors.forename: Ai-Wu
authors.initials: AW
authors.lastname: Li
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Wang
authors.forename: Han
authors.initials: H
authors.lastname: Yang
authors.forename: Bing-Rong
authors.initials: BR
authors.lastname: Gao
mesh_terms: D000042:Absorption; D001555:Benzene Derivatives / Q000737:chemistry*; D003460:Crystallization; D004126:Dimethylformamide / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry*; D012996:Solutions; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013997:Time Factors; D014050:Toluene / Q000737:chemistry; D014753:Vinyl Compounds / Q000737:chemistry*
chemical_list: C521978:2,5-dicyano-1,4-bis(2-(4-diphenylaminophenyl)vinyl)-benzene; D001555:Benzene Derivatives; D011145:Polyvinyls; D012996:Solutions; D012997:Solvents; D014753:Vinyl Compounds; C530822:oligo(p-phenylene vinylene); D014050:Toluene; D004126:Dimethylformamide